quizzes 18-29
Which one of the following combinations of units is equivalent to one henry? N × m × s2/C N × m × s/C N × m × C/ s2 N × m × C2 / s2 N × m × s2 /C2
N × m × s2 /C2
A resistor is connected to an ac power supply. On this circuit, the current A) lags the voltage by 45°. B) lags the voltage by 90°. C) is in phase with the voltage. D) leads the voltage by 90°. E) leads the voltage by 45°.
is in phase with the voltage.
Several electrons are placed on a hollow metal sphere. They
become uniformly distributed on the sphere's outer surface.
A dielectric material such as paper is placed between the plates of a capacitor holding a fixed charge. What happens to the electric field between the plates?
becomes weaker
Of the components of the electromagnetic spectrum listed below, which is associated with the shortest wavelengths?
gamma rays
Light enters air from water. The angle of refraction will be
greater than the angle of incidence.
The separation between adjacent maxima in a double-slit interference pattern using monochromatic light is
greatest for red light
Light wave A has twice the frequency of light wave B. The wavelength of light wave A is _____ that of light wave B.
half
When an object is closer to a concave mirror than the mirror's focal point, the
image distance is negative.
If you double the frequency in the circuit shown, the inductive reactance of the inductor
increases by a factor of 2.
When TOTAL REFLECTION occurs at a surface, the incident angle must be in the substance with the higher Question 8 options: A) index of refraction. B) incident angle. C) c/n. D) speed of light.
index of refraction
A device used chiefly for storing energy in a magnetic field is Question 15 options:an inductor.a resistor.a capacitor.a galvanometer.a dielectric.
inductor
Classical theory predicted that the photocurrent, of the photoelectric effect, should be proportional to the Question 10 options: A) intensity of light. B) wavelength of light. C) electric field magnitude. D) frequency of light.
intensity of light
What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?
interference
The pattern of light and dark fringes formed in Young's double-slit experiment is due to
interference and diffraction.
A positive charge in Figure 20.1 is moving to the right and experiences a vertical (upward) magnetic force. In which direction is the magnetic field?
into the page
Two wires lying in the plane of this page carry equal currents in opposite directions, as shown. At a point midway between the wires, the magnetic field is
into the page.
If the voltage applied to a parallel-plate capacitor is doubled, the electric field between the plates
is doubled.
If the voltage between the plates of a parallel-plate capacitor is doubled, the charge on the capacitor
is doubled.
A proton is moving at an angle of 80° to a uniform magnetic field. What is the relationship between the direction of the force on the proton and the direction of the magnetic field?
perpendicular to the magnetic field
The electric field at the surface of a conductor is
perpendicular to the surface.
If two elements of a circuit are in parallel, they must have the same
potential difference across them.
Two coherent sources of monochromatic light are located at S1 and S2 as shown. If the sources are in phase, the intensity at point P is a maximum when
r2 - r1 = λ
Which one of the following is the correct order of the electromagnetic spectrum from low to high frequencies?
radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays
Which one of the following is the correct representation of the electromagnetic waves from longer wavelength to shorter wavelength?
radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays
Which one of the following lists is a correct representation of electromagnetic waves from longer wavelength to shorter wavelength?
radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays
An image formed when the light rays pass through the image location, and could appear on paper or film placed at that location is referred to as a(n)
real image.
The image of an object located 10 cm from a concave spherical mirror of radius 10 cm is
real, inverted, and the same size.
Which color of light has the lowest energy photons?
red
If the voltage between the plates of a parallel-plate capacitor is doubled, the capacitance of the capacitor
remains the same.
The graph shows the potential difference across a resistor as a function of the current through the resistor. The slope of the resulting curve represents
resistance
In Figure 21.4, a coil of wire is placed on the axis of a solenoid carrying a DC current. Which of the following will NOT result in an EMF being induced in the coil?
rotate the coil about the z axis
The SI units of inductance times capacitance are Question 11 options:seconds squared.hertz.volts.amperes.ohms.
seconds squared
Which one of the following is not an electromagnetic wave?
sound waves
An image formed when the light rays do not actually pass through the image location, and would not appear on paper or film placed at that location is referred to as a(n)
virtual image.
When a real object is placed just inside the focal point F of a diverging lens, the image is
virtual, erect, and diminished.
The image formed by a concave mirror when the object is placed between the mirror and the focal point has the following characteristics:
virtual, upright, enlarged, image distance is larger than object distance
The equipotential surfaces between two spherical conductors are shown in Fig. 23-10, with the value of the potential marked for each line. What is the potential difference between points G and D (that is VG - VD) ?
-160 V
Which combination of charges would yield the greatest repulsive force between the charges? Question options: A) +1q and -3q B) +1q and +7q C) -1q and -4q D) -2q and -4q E) -2q and +4q
-2q and -4q
The resistivity of any given metal depends on its temperature. varies linearly with temperature. is the proportionality constant between the resistance, R, and the ratio of the length, L, to the cross-sectional area, A, of a wire made of the metal. has units of ohm-meter .is described by all of the above.
.is described by all of the above.
The left diagram shows a positively charged particle is moving with velocity v in a magnetic field B. Using the right diagram, the direction of the magnetic force on the particle is
1
Two very long, parallel conducting wires carry equal currents in opposite directions. The numbered diagrams show end views of the wires and the resultant force vectors due to current flow in each wire. Which diagram best represents the direction of the forces?
1
Which of the points shown in the diagram are at the same potential?
1 and 4
A student looks through a transmission grating at the light from a helium light source. He sees the red, yellow, and green light from the source superimposed on a meterstick. If the yellow lines are the ones indicated in the figure, then
1 and 4 are red; 2 and 3 are green.
The SI unit of magnetic field is the tesla (T). This is equivalent to N · s/(C · m)N · C/(s · m)N · m/s2C/(A · s)None of these is correct.
N · s/(C · m)
Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. The electric charge of each of the three particles is, respectively, 1 is neutral, 2 is negative, and 3 is positive. 1 is positive, 2 is negative, and 3 is neutral. 1 is neutral, 2 is positive, and 3 is negative. 1 is negative, 2 is neutral, and 3 is positive. 1 is positive, 2 is neutral, and 3 is negative.
1 is negative, 2 is neutral, and 3 is positive.
In a Compton scattering experiment, what scattering angle produces the greatest change in wavelength?
180
Photon A has twice the energy of photon B. The ratio of the momentum of A to that of B is
2
The index of refraction of diamond is 2.42. This means that a given frequency of light travels
2.42 times faster in vacuum than it does in diamond.
Two resistors are connected in parallel across a potential difference. The resistance of resistor A is twice that of resistor B. If the current carried by resistor A is I, what is the current carried by B?
2I
If three resistors in the various configurations shown are placed in a simple circuit, the configuration in which all three resistors carry the same current is
3
The figure depicts a uniform electric field. The direction in which there is no change in the electric potential is
3
The visible portion of the electromagnetic spectrum is closest to which of the following intervals?
400 to 700 nm
Which point in the electric field in the diagram is at the highest potential?
5
A resistor carries a current I. The power dissipated in the resistor is P. What is the power dissipated if the same resistor carries current 3I?
9P
The figure shows three long, parallel current-carrying wires. The magnitudes of the currents are equal and their directions are indicated in the figure. Which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic force acting on that wire?
A
Two charges Q1 and Q2 of equal magnitudes and opposite signs are positioned as shown in figure below. Which of the shown arrows represents correctly the electric field at point P?
A
Which of the arrows shown in Fig. 21-10 represents the correct direction of the electric field between the two metal plates?
A (pos to neg)
Consider a conductor for which R = the resistance in ohms, ρ = the resistivity, A = the cross sectional area in m2, and L = the length in meters. Which of the following is an expression for ρ?
AR/L
If a baseball, an electron, and a photon all have the same momentum, which has the longest wavelength?
All have the same wavelength.
A conductor is placed in an electric field under electrostatic conditions. Which of the following statements is correct for this situation? A) All valence electrons go to the surface of the conductor. B) The electric field on the surface of the conductor is perpendicular to the surface. C) The electric field is zero inside the conductor. D) All of the previous answers apply. E) None of the answers apply.
All of the previous answers apply.
Which of the following statements is true? Question options:A changing electric field induces a magnetic field.A changing magnetic field induces an electric field.Maxwell's equations predict the speed of light.Maxwell's equations predict that light is made up of oscillating electric and magnetic waves.All the above statements are true.
All the above statements are true.
The curve that best represents the current in a discharging RC circuit as a function of time is
B2
Battery A has a relatively high internal resistance, whereas battery B has a low internal resistance. If both batteries provide the same current to some external circuitry, which of the following statements is likely to be true?
Battery A is warmer to the touch than battery B.
Fig. 27-3 shows a small positive charge q moving toward a long current-carrying wire. Which of the arrows labeled A to D correctly represents the direction of the magnetic force applied on the charge? A) A B) B C) C D) D E) The force points in a direction perpendicular to the plane of the figure.
C
The curve that best represents the charge on the capacitor in a charging RC circuit as a function of time is
D 4
Capacitance of capacitors depends upon Question options: A) the geometry of the conductors. B) the material between the conductors. C) the space between the conductors. D) all of these answers. E) none of these answers.
D all
The figure shows the interference pattern obtained in a double-slit experiment using light of wavelength 600 nm.
E
The electrostatic force between the two charges placed at distance d apart is F. If you tripled the distance keeping all other conditions same, the force between them is now
F/9
Monochromatic light is incident on a metal surface and electrons are ejected. If the intensity of the light is increased, what will happen to the ejection rate and maximum energy of the electrons? Question 11 options: A) Same rate; same maximum energy. B) Greater rate; greater maximum energy. C) Greater rate; same maximum energy. D) Same rate; greater maximum energy.
Greater rate; same maximum energy.
Two resistors are connected in series across a potential difference. If the current carried by resistor A is I, what is the current carried by B?
I
The circuit in the figure contains a cell of emf ε and four resistors connected as shown. Let the currents in these resistances be designated by I1, I2, I3, I4, respectively. Which of the following equations is correct?
I1 = I2
Which of the following changes would increase the separation between the bright fringes in the diffraction pattern formed by a diffraction grating?
Increase the wavelength of the light used.
A beam of light that is parallel to the principal axis is incident on a convex mirror. What happens to the reflected beam of light?
It appears to be coming from the focal point on the other side of the mirror.
In a single-slit diffraction experiment, the width of the slit through which light passes is reduced. What happens to the width of the central bright fringe?
It becomes wider.
An electric circuit consists of a resistor connected across the terminals of an ac generator. How does the power dissipated in the resistor change as the frequency in the generator decreases? A) It does not change. B) It increases or decreases depending on the sign of the phase angle. C) It increases. D) It decreases.
It does not change
Correct units for electric potential are
J/C
Which of the following statements is false? Electric field lines due to an electric dipole and magnetic field lines due a magnetic dipole have similar configuration. Electric field starts from a positive charge and ends at a negative charge. Magnetic field starts at the north pole and ends at the south pole. Magnetic poles always occur in pairs. Magnetic fields result from the flow of charges.
Magnetic field starts at the north pole and ends at the south pole.
The ratio of energy to frequency for a given photon gives
Planck's constant.
Fig. 21-11 shows 3 electric charges labeled Q1, Q2, Q3 and some electric field lines in the region surrounding the charges. What are the signs of the 3 charges?
Q1 is positive, Q2 is negative, Q3 is positive.
The same potential difference is applied across two wires. Wire A carries twice the current of wire B. If the resistance of wire B is R, what is the resistance of wire A?
R/2
An object is placed in front of a concave spherical mirror as shown below. The three rays 1, 2, and 3, leave the top of the object and, after reflection, converge at a point on the top of the image. Ray 1 is parallel to the principal axis, ray 2 passes through F, and ray 3 passes through C. Select all correct statements about these rays.
Ray 2 will travel parallel to the principal axis after reflection. Rays 3 will reflect back on itself Ray 1 will pass through F after reflection.
Which one of the following statements concerning permanent magnets is/are correct? There may be more than one correct answers, The direction of a magnetic field is indicated by the north pole of a compass. Magnetic field lines outside a permanent magnet originate from the north pole and end on the south pole. When a permanent magnet is cut in half, one piece will be a north pole and one piece will be a south pole. The north pole of a permanent magnet is attracted to a south pole. All permanent magnets are surrounded by a magnetic field.
The direction of a magnetic field is indicated by the north pole of a compass. Magnetic field lines outside a permanent magnet originate from the north pole and end on the south The north pole of a permanent magnet is attracted to a south pole. All permanent magnets are surrounded by a magnetic field.
Which of the following statements is not true? Question options: In nature, electric charge is conserved. The force of repulsion between two like charges is directly proportional to the product of the square of the charges. The force of repulsion between two like charges is inversely proportional to the square of the distance separating the charges. Unlike charges attract each other. Like charges repel each other.
The force of repulsion between two like charges is directly proportional to the product of the square of the charges.
Which one of the following statements concerning the magnetic force on a charged particle in a magnetic field is true? Select all correct answers The magnetic force is a maximum if the particle is stationary. The magnetic force acts in the direction of motion for a positively charged particle. The magnetic force does no work on the particle. .The magnetic force is maximum if the particle moves perpendicular to the field. The magnetic force is a zero if the particle moves parallel to the field.
The magnetic force does no work on the particle. The magnetic force is maximum if the particle moves perpendicular to the field. The magnetic force is a zero if the particle moves parallel to the field.
If in a double-slit experiment the wavelength of light is increased, which of the following happens to the interference pattern shown on the screen?
The maxima get further apart.
If in a double-slit experiment the slit separation is increased, which of the following happens to the interference pattern shown on the screen?
The minima get closer together.
Consider two copper wires. One has twice the cross-sectional area of the other. How do the resistances of these two wires compare?
The thicker wire has half the resistance of the thinner wire.
For the current in a stationary circuit to induce a current in an independent stationary circuit, it is necessary for the first circuit to have
a changing current
Which of the following statements about parallel plate capacitor is false? A charged capacitor stores energy. The two plates have equal charges of the same sign. The capacitor store charges on the plates. The capacitance is proportional to the area. The capacitance is inversely proportional to the separation between the plates.
The two plates have equal charges of the same sign.
An X-ray photon scattering off an electron imparts some of its energy to the electron (the Compton effect). Which of the following statements is true?
The wavelength of the scattered photon is increased.
The image of an object, placed in front of a spherical convex mirror as shown, forms between
V and F and is diminished.
Which one of the following is/are correct. (There may be more than one correct answer) When four unequal resistors are connected in a parallel, the equivalent resistance is less than the smallest resistor. When resistors are connected in parallel, we can be certain that the potential difference across each is the same. When resistors are connected in series, the current flowing in each resistor is the same. When resistors are connected in parallel, the current flowing in each resistor is the same. When resistors are connected in series, we can be certain that the potential difference across each is the same.
When four unequal resistors are connected in a parallel, the equivalent resistance is less than the smallest resistor. When resistors are connected in parallel, we can be certain that the potential difference across each is the same. When resistors are connected in series, the current flowing in each resistor is the same.
What is a photon? Question 1 options: A) an electron in an excited state B) an electron that has been made electrically neutral C) one form of a nucleon, one of the particles that makes up the nucleus D) a small packet of electromagnetic energy that has particle-like properties
a small packet of electromagnetic energy that has particle-like properties
For certain angles, TOTAL INTERNAL REFLECTION can occur when light tries to pass from one medium to another which has Question 9 options: A) an index of refraction which is sin-1(n). B) an index of refraction which is sin-1(45°). C) a larger index of refraction. D) a smaller index of refraction. E) the same index of refraction.
a smaller index of refraction.
The technical name for the type of image formed by a single plane mirror is
a virtual image
Waves that are emitted in phase from two sources will undergo constructive interference when the paths from the sources differ by
a whole integer number of wavelengths.
If nonelectric forces are negligible, a positively charged particle released from rest in a nonuniform electric field
accelerates in the direction of the field
Which of the following statements about an inductor that is connected to an AC voltage is true? Question 14 options:The average power dissipated by the inductor is zero.At low frequencies the inductor behaves like a short circuit.At high frequencies the inductor behaves like an open short circuit. The inductive reactance is directly proportional to frequency. All the above statements are true.
all
Capacitors C1 and C2 are connected in series to the battery as shown. When you close switch S, a momentary current is indicated by ammeter A1 only. ammeter A2 only. ammeter A3 only. ammeter A1 and A3 only. all of the ammeters.
all of the ammeters.
The magnetic force on a charged particle depends on the sign of the charge on the particle. depends on the velocity of the particle. depends on the magnetic field at the particle's instantaneous position. is at right angles to both the velocity and the direction of the magnetic field. is described by all of these.
all of these
Which of the following statements about a capacitor that is connected to an AC voltage is true? Question 7 options:The average power dissipated by the capacitor is zero.At low frequencies the capacitor behaves like an open circuit.At high frequencies the capacitor behaves like a short circuit.At any given instant the net charges on the capacitor is zero.All the above statements are true.
all true
Consider an LRC circuit. The impedance of the circuit increases if R increases. When is this statement true? Question 15 options: A) true only if XL is equal to XC B) always true C) true only if XL is less than or equal to XC D) never true E) true only if XL is greater than or equal to XC
always true
The images formed by concave lenses Question 14 options: A) could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length. B) are always real. C) are always virtual. D) could be real or virtual, but always real when the object is placed at the focal point.
always virtual
Waves that are emitted in phase from two sources will undergo destructive interference when the paths from the sources differ by
an odd half-integer number of wavelengths.
You can change the magnetic flux through a given surface by
any combination of a-c (changing magnetic field strength, changing the surface area between the magnetic field and surface, changing the angle b/t field and surface in question)
As the frequency of the ac voltage across an inductor approaches zero, the inductive reactance of that coil Question 8 options:approaches unity.approaches zero.approaches infinity.none of the given answers
app zero
As the frequency of the ac voltage across a capacitor approaches zero, the capacitive reactance of that capacitor A) approaches infinity. B) approaches zero. C) approaches unity. D) none of the given answers
approaches infinity.
Plane mirrors produce images which
are always the same size as the actual object.
Two light sources are said to be coherent if they Question 4 options: A) are of the same amplitude, and maintain a constant phase difference. B) are of the same amplitude. C) are of the same frequency. D) are of the same frequency and amplitude. E) are of the same frequency, and maintain a constant phase difference.
are of the same frequency, and maintain a constant phase difference.
In a region where the electric field is uniform, the electric field lines
are parallel to one another and equally spaced.
A convex lens has a focal length f. An object is placed between f and 2f on the axis. The image formed is located Question 16 options: A) at f. B) at a distance greater than 2f from the lens. C) between the lens and f. D) between f and 2f. E) at 2f.
at a distance greater than 2f from the lens.
The image formed in a plane mirror is
at the same distance behind the mirror as the object is in front of the mirror.
When atom A loses an electron to atom B,
atom A becomes a positive ion and atom B becomes a negative ion.
A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held with its south pole downward, vertically above the center of the coil. The magnet is released from rest and falls toward the coil. As viewed from above, you can say that, as it falls, the magnet induces
clockwise current of the loop
Which of these five terms is most unlike the others? electromotive force voltage potential difference current electric potential
current
For an inductor, the Question 10 options:voltage lags behind the current.current lags behind the voltage.current and the voltage are in phase.current-voltage phase angle is greater than 90°.current-voltage phase angle is less than 90°.
current lags behind the voltage.
In the spectrum of a blackbody, the wavelength of peak intensity
decreases as temperature increases.
If you double the frequency in the circuit shown, the capacitative reactance of the circuit
decreases the factor by 2
In the Compton effect, as the scattering angle increases, the frequency of the X-rays scattered at that angle
decreases.
What principle is responsible for light spreading as it passes through a narrow slit?
diffraction
A concave (diverging) lens can produce an image that is
diminished, erect, and virtual.
As the frequency in this simple AC circuit increases, the rms current through the resistor
does not change
If you double the frequency in the circuit shown, the inductance of the inductor Question 13 options:increases by a factor of 2does not changedecreases by a factor of 2increases by a factor of 4decreases by a factor of 4
does not change
If the area of the plates of a parallel-plate capacitor is doubled, the capacitance is
doubled.
Doubling the resistance in an RC circuit Question 21 options:doubles the time constant of the circuit.halves the time constant of the circuit.has no effect on the time constant of the circuit.has no effect on the rate at which energy is dissipated by the circuit.None of these is correct. Previous PageNext Page
doubles time constant
A blackbody is an ideal system that
either absorbs 100% of the light incident upon it, or emits 100% of the radiation it generates.
The electron volt is a unit of
energy
A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is Question 17 options: A) less than the battery's terminal voltage, but greater than zero. B) equal to the battery's terminal voltage. C) greater than the battery's terminal voltage. D) zero.
equal B
The energy per unit volume in an EM wave is
equally divided between the electric and magnetic fields.
The energy per unit volume in an electromagnetic wave is
equally divided between the electric and magnetic fields.
A converging lens and a screen are so arranged that an image of the sun falls on the screen. The distance from the lens to the screen is Question 17 options:the focal length.the object distance.the magnifying power.one-half the radius of curvature of one of the lens faces.the average radius of curvature of the two lens faces.
focal length
A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight, the particle will
follow a circular path.
Electromagnetic waves are produced when
free electric charges accelerate.
In order for a photon to eject an electron from a metal's surface in the photoelectric effect, the photon's
frequency must be greater than a certain minimum value.
When the positive current in a long wire is flowing in a direction from S to N, it creates a magnetic field below the wire that is directed
from E to W.
In Figure 21.10, a bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field, perpendicular to the plane of the rails, is present. The bar is in motion with velocity ν. The induced current through the resistor R is:
from a to b
In Figure 21.6, a bar magnet moves away from the solenoid. The induced current through the resistor R is:
from a to b
Current flows through a resistor
from high potential to low potential.
A negative charge, if free, will tend to move
from low potential to high potential.
Which of the following statements is false? isolated electric charges exist Electric field lines diverge from positive charges and converge on negative charges. The flux of the magnetic field vector is zero through any closed surface. isolated magnetic poles exist changing electric fields induce changing magnetic fields
isolated magnetic poles exist
How much does the energy stored in an inductor change if the current through the inductor is doubled?
it is quadrupled
After you measure the self-inductance of a coil, you unwind it and then rewind half the length of wire into a coil with the same diameter but half the number of turns. How does this change the self-inductance? it is the same it is doubled it is quadrupled it is halved it is quartered
it is quartered
The energy of a photon depends on
its frequency
For a proton moving in the direction of the electric field
its potential energy decreases and its electric potential decreases.
When a light wave enters into a medium of different refractive index Question 6 options:its frequency and wavelength change.its speed, frequency, and wavelength change.its speed and wavelength change.its speed and frequency change.
its speed and wavelength change.
When light goes from one material into another material having a HIGHER index of refraction
its speed and wavelength decrease, but its frequency stays the same.
Which law does the following statement express? "In all cases of electromagnetic induction, the induced voltages have a direction such that the currents they produce oppose the effect that produces them."
lenz's law
The three loops of wire shown in Fig. 29-1 are all subject to the same uniform magnetic field that does not vary with time. Loop 1 oscillates back and forth as the bob in a pendulum, loop 2 rotates about a vertical axis, and loop 3 oscillates up and down at the end of a spring. Which loop, or loops, will have an induced emf?
loop 2
A changing electric field will produce a
magnetic field.
When an object is closer to a convex mirror than the mirror's focal point, the
magnification is less than one.
When an object is farther from a convex mirror than the mirror's focal point, the
magnification is less than one.
When an object is farther from a concave mirror than twice the mirror's focal length, the
magnification is less than one. image is inverted. image distance is less than the object distance. image is real. All of these are correct.
A concave spherical mirror can produce which one of the following types of images?
magnified, erect, and virtual
The angle of incidence Question 11 options: A) is always greater than the angle of refraction. B) is always less than the angle of refraction. C) may be greater than, less than, or equal to the angle of refraction. D) must equal the angle of refraction.
may be greater than, less than, or equal to the angle of refraction.
An electric generator transforms A) direct current into alternating current. B) chemical energy into electrical energy. C) mechanical energy into electrical energy. D) electrical energy into mechanical energy. E) alternating current into direct current.
mechanical energy into electrical energy.
When the slits in Young's experiment are moved closer together, the fringes
move further apart.
In order for a lens to produce a real image, the light rays from the object Question 13 options:must actually be focused at the image locationcome to a stop at the image location.appear to be focused at the image location.must first travel in a straight line parallel to the axis.will always be focused at the image location.
must actually be focused at the image location
A copper ring lies in the yz plane as shown. The magnet's long axis lies along the x axis. Induced current flows through the ring as indicated. The magnet
must be moving toward the ring
A ray of light goes from one transparent material into another, as shown in the figure. What can you conclude about the indices of refraction of these two materials?
n1 > n2
X and Y are two uncharged metal spheres on insulating stands, and are in contact with each other. A positively charged rod R is brought close to X as shown in Figure 17.6a. Sphere Y is now moved away from X (Figure 17.6b). What are the final charge states of X and Y, respectively?
negative and positive
A transformer is a device that Question 16 options: A) operates only on DC. B) operates on either DC or AC. C) operates only on AC. D) increases the power level of a circuit.
operates only on AC
The direction of the force on a current-carrying wire in a magnetic field is described by which of the following?
perpendicular to both the current and the magnetic field
In an electromagnetic wave, the electric and magnetic fields are oriented such that they are
perpendicular to one another and perpendicular to the direction of wave propagation
An equipotential surface must be
perpendicular to the electric field at every point.
If the number of turns on the secondary coil of a transformer are less than those on the primary, the result is a Question 17 options:step-down transformer.a dc transformer.120-V transformer.220-V transformer.step-up transformer.
step down transformer
The direction of the electric field at a point is the same as
the force on a proton placed at that point.
Kirchhoff's junction rule is a statement of
the law of conservation of charge.
Kirchhoff's loop rule is a statement of
the law of conservation of energy.
The phenomenon of magnetism is best understood in terms of the existence of magnetic poles. the magnetic fields associated with the movement of charged particles. gravitational forces between nuclei and orbital electrons. electrical fluids. None of these is correct.
the magnetic fields associated with the movement of charged particles.
A blue laser beam is incident on a metallic surface, causing electrons to be ejected from the metal. If the frequency of the laser beam is increased while the intensity of the beam is held fixed,
the rate of ejected electrons will decrease and the maximum kinetic energy will increase.
The speed of ultraviolet radiation in free space compared with the speed of visible radiation in free space is
the same
A horizontal wire carries a current straight toward you. From your point of view, the magnetic field at a point directly below the wire points
to the right.
The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence greater than this angle will be Question 10 options: A) absorbed. B) totally transmitted. C) partially reflected and partially transmitted. D) totally reflected.
totally reflected
The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence greater than this angle will be Question 7 options: A) totally reflected. B) absorbed. C) totally polarized. D) partially reflected and partially transmitted. E) totally transmitted.
totally reflected
A proton, moving west, enters a magnetic field of a certain strength. Because of this magnetic field the proton curves upward. What is the direction of this magnetic field?
towards the south
An electron, moving south, enters a magnetic field of certain strength. Because of this field the electron curves upward. What is the direction of the magnetic field?
towards the west
Breaking a bar magnet in half will produce A) one North and one South monopole. B) a single South magnetic monopole. C) a single North magnetic monopole. D) two bar magnets.
two bar magnets.
An object is placed in front of a convex mirror at a distance closer than the focal length of the mirror. The image will appear
upright and reduced.
An object is placed in front of a convex mirror at a distance larger than twice the focal length of the mirror. The image will appear
upright and reduced.
The SI units of electric fields can be expressed as
v/m
Light travels fastest Question 5 options: A) through water. B) through glass. C) through diamond. D) in a vacuum.
vacuum
In the spectrum of white light which one of the following colors corresponds to the highest temperature?
violet
Which of the following sets of characteristics describes the image formed by a plane mirror?
virtual and upright
For a capacitor, the voltage lags behind the current.current lags behind the voltage.current and the voltage are in phase.current-voltage phase angle is greater than 90°.current-voltage phase angle is less than 90°.
voltage lags behind the current
If n1 is the index of refraction for the incident medium and n2 is the index for the refracting medium, the critical angle will exist Question 12 options: A) when n1 > n2. B) when n1 = n2. C) never. D) in all cases, it will just have different values. E) when n1 < n2.
when n1 > n2.
Resonance in a series LRC circuit occurs when Question 16 options: A) (XL - XC)2 is equal to R2. B) (XL - XC)2 is greater than R2. C) XC is greater than XL. D) XL is greater than XC. E) XC equals XL.
xc equals xl
A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. When this system reaches its steady-state, the voltage across the resistor is Question 18 options: A) greater than the battery's terminal voltage. B) zero. C) less than the battery's terminal voltage, but greater than zero. D) equal to the battery's terminal voltage.
zero
The average energy dissipated in an inductor is Question 9 options: A) proportional to the inductance. B) proportional to the frequency. C) proportional to both the inductance and frequency. D) zero. E) none of the above.
zero
A proton has five times the momentum of an electron. If the electron has a de Broglie wavelength λ, then the de Broglie wavelength of the proton is
λ/5
An electromagnetic wave with components Ey = Eo sin(kx - ωt) and Bz = Bo sin(kx - ωt) is a wave with a frequency of
ω/2π.
